------------[ cut here ]------------
sk->sk_forward_alloc
WARNING: net/ipv4/af_inet.c:157 at inet_sock_destruct+0x653/0x800 net/ipv4/af_inet.c:157, CPU#0: rm/8530
Modules linked in:
CPU: 0 UID: 0 PID: 8530 Comm: rm Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:inet_sock_destruct+0x653/0x800 net/ipv4/af_inet.c:157
Code: a9 4f ff e9 06 fd ff ff e8 2a 19 14 f8 90 0f 0b 90 e9 35 fe ff ff e8 1c 19 14 f8 90 0f 0b 90 e9 c5 fe ff ff e8 0e 19 14 f8 90 <0f> 0b 90 e9 04 ff ff ff e8 00 19 14 f8 90 0f 0b 90 e9 65 fe ff ff
RSP: 0018:ffffc90000007d98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888036e24a40 RCX: ffffffff89f2e537
RDX: ffff8880296a4980 RSI: ffffffff89f2e632 RDI: ffff8880296a4980
RBP: 0000000000000090 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000090 R11: 0000000000000000 R12: ffff888036e24a40
R13: ffff888036e24ad0 R14: ffffffff81ece74b R15: 0000000000000009
FS:  00007f24bdb8dc80(0000) GS:ffff8880d65d9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f24bdd61a90 CR3: 0000000027232000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 __sk_destruct+0x85/0xbb0 net/core/sock.c:2350
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core+0x7c0/0x15c0 kernel/rcu/tree.c:2857
 handle_softirqs+0x1ea/0x910 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xef/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:deref_stack_regs arch/x86/kernel/unwind_orc.c:438 [inline]
RIP: 0010:unwind_next_frame+0x1345/0x1ea0 arch/x86/kernel/unwind_orc.c:611
Code: be 98 00 00 00 48 89 4c 24 18 e8 d6 e4 ff ff 48 8b 34 24 48 8b 4c 24 18 48 ba 00 00 00 00 00 fc ff df 48 c1 ee 03 80 3c 16 00 <0f> 85 99 06 00 00 4c 89 e2 49 89 45 38 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc90004197248 EFLAGS: 00000246
RAX: 00007ffe39fb87d8 RBX: 0000000000000001 RCX: ffffffff914b4ade
RDX: dffffc0000000000 RSI: 1ffff92000832e5e RDI: ffffc90004197fe0
RBP: ffffc90004197300 R08: ffffffff914b4ae2 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000001 R12: ffffc90004197308
R13: ffffc900041972b8 R14: ffffc90004197f48 R15: 0000000004198001
 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x2ad/0x780 mm/slub.c:5270
 mt_alloc_one lib/maple_tree.c:174 [inline]
 mas_alloc_nodes+0x280/0x390 lib/maple_tree.c:1110
 mas_preallocate+0x39c/0xf10 lib/maple_tree.c:5194
 vma_iter_prealloc mm/vma.h:505 [inline]
 __split_vma+0x33d/0xe30 mm/vma.c:526
 split_vma mm/vma.c:596 [inline]
 vma_modify+0x1127/0x2330 mm/vma.c:1674
 vma_modify_flags+0x257/0x3d0 mm/vma.c:1694
 mprotect_fixup+0x209/0xb40 mm/mprotect.c:756
 do_mprotect_pkey+0x9e1/0xe70 mm/mprotect.c:930
 __do_sys_mprotect mm/mprotect.c:951 [inline]
 __se_sys_mprotect mm/mprotect.c:948 [inline]
 __x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:948
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f24bdf242c7
Code: 89 3d fd 3f 01 00 eb 90 0f 1f 00 f7 d8 89 05 f0 3f 01 00 48 c7 c0 ff ff ff ff eb 91 0f 1f 80 00 00 00 00 b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d c9 3f 01 00 f7 d8 89 01 48 83
RSP: 002b:00007ffe39fb87d8 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007f24bdbfb6b0 RCX: 00007f24bdf242c7
RDX: 0000000000000001 RSI: 0000000000001000 RDI: 00007f24bdbef000
RBP: 00007ffe39fb8aa0 R08: 0000000000000000 R09: 00007f24bdc8e2e0
R10: 00007f24bdbfb6b0 R11: 0000000000000206 R12: 0000000000000038
R13: 0000004914dee59a R14: 0000000000000000 R15: 00007f24bdf38310
 </TASK>
----------------
Code disassembly (best guess):
   0:	be 98 00 00 00       	mov    $0x98,%esi
   5:	48 89 4c 24 18       	mov    %rcx,0x18(%rsp)
   a:	e8 d6 e4 ff ff       	call   0xffffe4e5
   f:	48 8b 34 24          	mov    (%rsp),%rsi
  13:	48 8b 4c 24 18       	mov    0x18(%rsp),%rcx
  18:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  1f:	fc ff df
  22:	48 c1 ee 03          	shr    $0x3,%rsi
  26:	80 3c 16 00          	cmpb   $0x0,(%rsi,%rdx,1)
* 2a:	0f 85 99 06 00 00    	jne    0x6c9 <-- trapping instruction
  30:	4c 89 e2             	mov    %r12,%rdx
  33:	49 89 45 38          	mov    %rax,0x38(%r13)
  37:	48                   	rex.W
  38:	b8 00 00 00 00       	mov    $0x0,%eax
  3d:	00 fc                	add    %bh,%ah
  3f:	ff                   	.byte 0xff